Z2 is the name of the new product by Zenefits, the once-troubled, $2 billion startup.

Nest, the home automation company owned by Google's parent company Alphabet, had its own sign too.

Business Insider/Eugene Kim

CallidusCloud is a public company with a market cap of $1.1 billion. They basically sell sales and marketing people a bunch of tools to close deals faster.

Business Insider/Eugene Kim

Of all the signs we saw, this was our favourite: Machine learning startup H2O.ai wishing a happy Diwali to Microsoft CEO Satya Nadella and Google CEO Sundar Pichai. Diwali is the Hindu festival of lights, celebrated this year on October 30.